/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraParameters.h
Fills only selected constants into the table. In the order they appear in the array of passed names not the order they appear in the set. Checks the passed map for entries to supersede the default values in the set.
void AppendToConstantsTable ( uint8 * ConstantsTable, const [FNiagaraParameters](API\Plugins\Niagara\FNiagaraParameters) & Externals ) const